platform: Make platform_bus_type constant

Since commit d492cc2573a0 ("driver core: device.h: make struct
bus_type a const *"), the driver core can properly handle constant
struct bus_type, move the platform_bus_type variable to be a constant
structure as well, placing it into read-only memory which can not be
modified at runtime.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Link: https://lore.kernel.org/r/20240823075544.144426-1-kunwu.chan@linux.dev
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 4c3ee6521ba5f2a9f34e7ea9a562fb0d784f3514..6f2a33722c5203ac196a6e36e153648d0fe6c6d4 100644 (file)
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1474,7 +1474,7 @@ static const struct dev_pm_ops platform_dev_pm_ops = {
        USE_PLATFORM_PM_SLEEP_OPS
 };
 
-struct bus_type platform_bus_type = {
+const struct bus_type platform_bus_type = {
        .name           = "platform",
        .dev_groups     = platform_dev_groups,
        .match          = platform_match,

diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index d422db6eec63d0217332dff7f2897f6062be6d53..7132623e4658576f0be2a80b493e445e0c9d4de6 100644 (file)
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -52,7 +52,7 @@ struct platform_device {
 extern int platform_device_register(struct platform_device *);
 extern void platform_device_unregister(struct platform_device *);
 
-extern struct bus_type platform_bus_type;
+extern const struct bus_type platform_bus_type;
 extern struct device platform_bus;
 
 extern struct resource *platform_get_resource(struct platform_device *,